ol"blue

X2 on that.

GI-Jeepin'

I have a 2001 WJ but I have the 4.0l. When I bought mine it did the same thing, no cruise and air only blew out of the defroster. Traced it down to a rotted 1/4" dia vacuum hose under the battery. Look for your Cruise Control Vacuum modulator thingy. Some cars it looks like a ball, others it looks like a hockey puck with a vacuum hose attached to the front and back.

Like i said, on my Jeep it was under the battery, don't know where it is on yours.

rookcherokee

Well, I've been trying to check all of the vacuum lines and found that there was actually a hole in the vacuum reservoir under the battery tray. I pinched off the hose to see if anything would change and still, nothing from the vents. I can't seem to find the vacuum line that goes through the firewall though. The line that connects to the reservoir goes straight to the engine. (The link Dan posted says, the line from the reservoir goes through the firewall.) But on mine, it doesn't.

Does anyone have a picture or can direct me to where that line is? Thanks again

ol"blue

The cannister stores vacuum, the engine keeps it at a vacuum. Any vacuum line that goes through the firewall is for the ac control head. There's no reason for any others. I can't find a vac diagram at this time.

A few months ago all my files were lost. I'm still trying to get back to where I was. No back-up.

GI-Jeepin'

Your on the right track, but pinching off the hose wont help any. Have you tried placing duct tape over the hole in the Vac reservoir? I'll bet thats it.

rookcherokee

No worries, Blue! Thanks for the info.

I found this picture on a similar thread:


Basically what mine looks like, except for the circled part (the "t" part just has a cap.) And for the squared part, I don't have that at all.

I only have the line from the engine to the reservoir under the battery.

Any ideas?

Edit: Image is from this thread: http://www.jeepforum.com/forum/f13/5...nquiry-651815/

rookcherokee

That was my next idea!

Might have to run out and grab some from the store.

Thanks

ol"blue

That's on a '98. Yours will be different, but going to the same are on the firewall as mentioned in the thread. Is there any vacuum lines, nipples, or fittings, on the intake, that have a cap on them, or a place where the line can go? Or maybe the brake booster?

rookcherokee

I put some duct tape on there and patched up the hole, no luck.

Here's a couple of pictures I just took of my vacuum line:





To the left it goes around to the vacuum reservoir under the battery tray.

ol"blue

You need to find the fitting on the intake so that you can trace the line, or run a new one.
This comes from the FSM.
VACUUM CHECK VALVE
A one-way vacuum check valve is installed in the
accessory vacuum supply line near the vacuum tap
on the engine intake manifold. This check valve
helps to maintain the system vacuum needed to
retain the selected heater-A/C mode settings. It prevents
the engine from bleeding down system vacuum
through the intake manifold during extended heavy
engine load (low engine vacuum) operation.
The vacuum check valve cannot be repaired and, if
faulty or damaged, it must be replaced.

VACUUM RESERVOIR
The vacuum reservoir is mounted in the engine
compartment on the underside of the battery tray.
Vacuum stored in the reservoir is used to operate the
vacuum-controlled vehicle accessories during periods
of low engine vacuum, such as when the vehicle is
climbing a steep grade or under other high engine
load operating conditions.
The vacuum reservoir cannot be repaired and, if
faulty or damaged, it must be replaced.

GI-Jeepin'

I was really hoping it was the vacuum line as that is the cheapest and easiest to repair. It is a possibility that your having blend door issues. Although I personnally would go through every inch of the vacuum line before i delve into that possibility.

rookcherokee

Sorry, got confused on this one. Where is this line I'm looking for supposed to be located exactly? Does it go through the firewall at any point?

rookcherokee

Me too. It might be possible, but I could of swore I read somewhere that the 95 ZJ didn't have the blend doors, only the 96+ models? Could be mistaken though.

ol"blue

If I had a diagram I'd have posted it before now, sorry. And I sold my '97 V8 ZJ to my son, so I can't look at that.
There has to be a vacuum nipple tree or vacuum source on the intake, throttle body, or brake booster, to get vacuum for the ac control. And yes, the line then has to go from the vacuum source through the firewall.
For some reason, I seem to remember a small vacuum line coming off of the brake booster. I'm not positive if it was on my ZJ though, or on one of my turbo Omni's. I can't find any pics.
They had blend doors too.

rookcherokee

I found just found this diagram:


I assume "to atmosphere" is where it goes through the fire wall?